20771667515720 has 128 divisors (see below), whose sum is σ = 51131148963840. Its totient is φ = 7531692426240.

The previous prime is 20771667515671. The next prime is 20771667515741. The reversal of 20771667515720 is 2751576617702.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 774673034 + ... + 774699846.

It is an arithmetic number, because the mean of its divisors is an integer number (399462101280).

Almost surely, 2^{20771667515720} is an apocalyptic number.

20771667515720 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20771667515720, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (25565574481920).

20771667515720 is an abundant number, since it is smaller than the sum of its proper divisors (30359481448120).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20771667515720 is a wasteful number, since it uses less digits than its factorization.

20771667515720 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 31815 (or 31811 counting only the distinct ones).

The product of its (nonzero) digits is 8643600, while the sum is 56.

The spelling of 20771667515720 in words is "twenty trillion, seven hundred seventy-one billion, six hundred sixty-seven million, five hundred fifteen thousand, seven hundred twenty".